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Input: wacom - read 3rd gen Bamboo Touch HID data

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Override invalid pen based pktlen and x/y_max with touch
values from HID report.

Since active area of pen and touch are same on these
devices, set physical x/y size while pen x/y_max and
resolution are still valid.

Signed-off-by: Chris Bagwell <chris@cnpbagwell.com>
Acked-by: Ping Cheng <pingc@wacom.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Chris Bagwell 2011-10-26 22:32:52 -07:00 committed by Dmitry Torokhov
parent c5981411f6
commit 4134361af6
2 changed files with 48 additions and 2 deletions
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49
drivers/input/tablet/wacom_sys.c
View File

@ -28,7 +28,9 @@
#define HID_USAGE_Y_TILT 0x3e
#define HID_USAGE_FINGER 0x22
#define HID_USAGE_STYLUS 0x20
#define HID_COLLECTION 0xc0
#define HID_COLLECTION 0xa1
#define HID_COLLECTION_LOGICAL 0x02
#define HID_COLLECTION_END 0xc0
enum {
WCM_UNDEFINED = 0,
@ -165,6 +167,35 @@ static void wacom_close(struct input_dev *dev)
usb_autopm_put_interface(wacom->intf);
}
static int wacom_parse_logical_collection(unsigned char *report,
struct wacom_features *features)
{
int length = 0;
if (features->type == BAMBOO_PT) {
/* Logical collection is only used by 3rd gen Bamboo Touch */
features->pktlen = WACOM_PKGLEN_BBTOUCH3;
features->device_type = BTN_TOOL_DOUBLETAP;
/*
* Stylus and Touch have same active area
* so compute physical size based on stylus
* data before its overwritten.
*/
features->x_phy =
(features->x_max * features->x_resolution) / 100;
features->y_phy =
(features->y_max * features->y_resolution) / 100;
features->x_max = features->y_max =
get_unaligned_le16(&report[10]);
length = 11;
}
return length;
}
/*
* Interface Descriptor of wacom devices can be incomplete and
* inconsistent so wacom_features table is used to store stylus
@ -193,6 +224,10 @@ static void wacom_close(struct input_dev *dev)
* X/Y maximum as well as the physical size of tablet. Since touch
* interfaces haven't supported pressure or distance, this is enough
* information to override invalid values in the wacom_features table.
*
* 3rd gen Bamboo Touch no longer define a Digitizer-Finger Pysical
* Collection. Instead they define a Logical Collection with a single
* Logical Maximum for both X and Y.
*/
static int wacom_parse_hid(struct usb_interface *intf,
struct hid_descriptor *hid_desc,
@ -355,10 +390,20 @@ static int wacom_parse_hid(struct usb_interface *intf,
}
break;
case HID_COLLECTION:
case HID_COLLECTION_END:
/* reset UsagePage and Finger */
finger = usage = 0;
break;
case HID_COLLECTION:
i++;
switch (report[i]) {
case HID_COLLECTION_LOGICAL:
i += wacom_parse_logical_collection(&report[i],
features);
break;
}
break;
}
}

1
drivers/input/tablet/wacom_wac.h
View File

@ -22,6 +22,7 @@
#define WACOM_PKGLEN_TPC1FG 5
#define WACOM_PKGLEN_TPC2FG 14
#define WACOM_PKGLEN_BBTOUCH 20
#define WACOM_PKGLEN_BBTOUCH3 64
/* device IDs */
#define STYLUS_DEVICE_ID 0x02